bituminous coal burns more like wood, but has more clinkers and smoke. Cheaper.
Anthrocite is very clean, few clinkers, high btu, but more expensive.
I use less then 1/2 of anth than what I used to use from bituminous coal. I don't know what I pay for anth, because I trade help. I use 2.75-5T per season depending of the winter. This winter, I only used 1.5T and 2 cords for a 4000sqft house. I'll probably finish at less than 3T and 3 cords of wood.
Some areas anth can be very expensive; $200-$300 per Ton! I can't split and cut so much wood anymore, so coal works for me. They bring it and they dump it. Than it can sit there for 30 years in rain and snow if need to, there will be no change. It helps if you cover it up with a tarp so it doesn't freeze in clumps. I just have a lean to like shed for it.
I hope this helps.